I have some gear that only supports RSTP (version 2 BPDUs), and other gear that supports MSTP (version 3 BPDUs). I understand how a structured network can be designed with MSTP domains and external RSTP switches; however, that is not possible with my scenario. Ideally I would like to just connect these two types of gear together and run xSTP. Would this work? I realize that the MSTP switches use hop count, whereas the RSTP switches use max-age and current-age, and that each switch type ignores the other's counter. Would this essentially enlarge the network diameter? How would the behavior of the network be affected?